Bibtex php preg_match_all - php

Question

I have a text file with a Bibtex export.
The text file has a number of entries following the pattern below.
#article{ls_leimeister,
added-at = {2013-01-18T11:14:11.000+0100},
author = {Wegener, R. and Leimeister, J. M.},
biburl = {http://www.bibsonomy.org/bibtex/27bb26b4b4858439f81aa0ec777944ac5/ls_leimeister},
journal = {International Journal of Technology Enhanced Learning (to appear)},
keywords = {Challenges Communities: Factors Learning Success VirtualCommunity and itegpub pub_jml pub_rwe},
note = {JML_390},
title = {Virtual Learning Communities: Success Factors and Challenges},
year = 2013
}
I want to use php and considered preg_match_all
The following didnt get me anywhere:
preg_match_all('/#^.*}$/', file_get_contents($file_path),$results);
I wanted to start simple, but that didnt really work.
I am kinda new to php RegEx.
The perfect final output would be:
Array
(
[0] => Array
(
['type'] => article
['unique_name'] => ls_leimeister
['added-at'] => 2013-01-18T11:14:11.000+0100
['author'] => Wegener, R. and Leimeister, J. M.
['biburl'] => http://www.bibsonomy.org/bibtex/27bb26b4b4858439f81aa0ec777944ac5/ls_leimeister
['journal'] => International Journal of Technology Enhanced Learning (to appear)
['keywords'] => Challenges Communities: Factors Learning Success VirtualCommunity and itegpub pub_jml pub_rwe
['note'] => JML_390
['title'] => Virtual Learning Communities: Success Factors and Challenges
['year'] => 2013
)
[1] => Array
(
[...] => …
)
)

Answer 1

Try this : Here I have fetched only type and unique_name, by looking at it, you can fetch all others.
$str = '#article{ls_leimeister,
added-at = {2013-01-18T11:14:11.000+0100},
author = {Wegener, R. and Leimeister, J. M.},
biburl = {http://www.bibsonomy.org/bibtex/27bb26b4b4858439f81aa0ec777944ac5/ls_leimeister},
journal = {International Journal of Technology Enhanced Learning (to appear)},
keywords = {Challenges Communities: Factors Learning Success VirtualCommunity and itegpub pub_jml pub_rwe},
note = {JML_390},
title = {Virtual Learning Communities: Success Factors and Challenges},
year = 2013
}';
preg_match_all('/#(?P<type>\w+){(?P<unique_name>\w+),(.*)/',$str,$matches);
echo $matches['type'][0];
echo "<br>";
echo $matches['unique_name'][0];
echo "<br>";
echo "<pre>";
print_r($matches);
Output array format will be little different from yours, but you can change this format to yours.

Answer 2

Pattern: /^#([^{]+)\{([^,]+),\s*$|^\s*([^\R#=]+) = \{(.*?)}/ms (Demo)
This pattern has two alternatives; each containing two capture groups.
type and unique_name are captured and stored in elements [1] and [2].
all other key-value pairs are stored in elements [3] and [4].
This separated array storage allows reliable processing when constructing the desired output array structure.
Input:
$bibtex='#BOOK{ko,
title = {Wissenschaftlich schreiben leicht gemacht},
publisher = {Haupt},
year = {2011},
author = {Kornmeier, M.},
number = {3154},
series = {UTB},
address = {Bern},
edition = {4},
subtitle = {für Bachelor, Master und Dissertation}
}
#BOOK{nial,
title = {Wissenschaftliche Arbeiten schreiben mit Word 2010},
publisher = {Addison Wesley},
year = {2011},
author = {Nicol, N. and Albrecht, R.},
address = {München},
edition = {7}
}
#ARTICLE{shome,
author = {Scholz, S. and Menzl, S.},
title = {Alle Wege führen nach Rom},
journal = {Medizin Produkte Journal},
year = {2011},
volume = {18},
pages = {243-254},
subtitle = {ein Vergleich der regulatorischen Anforderungen und Medizinprodukte
in Europa und den USA},
issue = {4}
}
#INBOOK{shu,
author = {Schulz, C.},
title = {Corporate Finance für den Mittelstand},
booktitle = {Praxishandbuch Firmenkundengeschäft},
year = {2010},
editor = {Hilse, J. and Netzel, W and Simmert, D.B.},
booksubtitle = {Geschäftsfelder Risikomanagement Marketing},
publisher = {Gabler},
pages = {97-107},
location = {Wiesbaden}
}';
Method: (Demo)
$pattern='/^#([^{]+)\{([^,]+),\s*$|^\s*([^\R#=]+) = \{(.*?)}/ms';
if(preg_match_all($pattern,$bibtex,$out,PREG_SET_ORDER)){
foreach($out as $line){
if(isset($line[1])){
if(!isset($line[3])){ // this is the starting line of a new set
if(isset($temp)){
$result[]=$temp; // send $temp data to permanent storage
}
$temp=['type'=>$line[1],'unique_name'=>$line[2]]; // declare fresh new $temp
}else{
$temp[$line[3]]=$line[4]; // continue to store the $temp data
}
}
}
$result[]=$temp; // store the final $temp data
}
var_export($result);
Output:
array (
0 =>
array (
'type' => 'BOOK',
'unique_name' => 'ko',
'title' => 'Wissenschaftlich schreiben leicht gemacht',
'publisher' => 'Haupt',
'year' => '2011',
'author' => 'Kornmeier, M.',
'number' => '3154',
'series' => 'UTB',
'address' => 'Bern',
'edition' => '4',
'subtitle' => 'für Bachelor, Master und Dissertation',
),
1 =>
array (
'type' => 'BOOK',
'unique_name' => 'nial',
'title' => 'Wissenschaftliche Arbeiten schreiben mit Word 2010',
'publisher' => 'Addison Wesley',
'year' => '2011',
'author' => 'Nicol, N. and Albrecht, R.',
'address' => 'München',
'edition' => '7',
),
2 =>
array (
'type' => 'ARTICLE',
'unique_name' => 'shome',
'author' => 'Scholz, S. and Menzl, S.',
'title' => 'Alle Wege führen nach Rom',
'journal' => 'Medizin Produkte Journal',
'year' => '2011',
'volume' => '18',
'pages' => '243-254',
'subtitle' => 'ein Vergleich der regulatorischen Anforderungen und Medizinprodukte
in Europa und den USA',
'issue' => '4',
),
3 =>
array (
'type' => 'INBOOK',
'unique_name' => 'shu',
'author' => 'Schulz, C.',
'title' => 'Corporate Finance für den Mittelstand',
'booktitle' => 'Praxishandbuch Firmenkundengeschäft',
'year' => '2010',
'editor' => 'Hilse, J. and Netzel, W and Simmert, D.B.',
'booksubtitle' => 'Geschäftsfelder Risikomanagement Marketing',
'publisher' => 'Gabler',
'pages' => '97-107',
'location' => 'Wiesbaden',
),
)
Here is the site that I extracted new sample input strings from.